Pivoted feed leg type rock drill

Claim 1

IN A SELF-CONTAINED PORTABLE HAMMER ROCK DRILL, THE COMBINATION WITH A DRILLING TOOL HINGEDLY CONNECTED TO AN EXTENSIBLE FEED LEG WITH THE LATTER HAVING ONE END ENGAGEABLE WITH AN EXTRANEOUS ABUTMENT SUCH AS THE GROUND, THE TOOL HAVING A REAR HANDLE ADAPTED TO BE GRASPED BY THE OPERATOR IN THE SUPPORTING AND POSITIONING OF THE TOOL, OF AN AUXILIARY POWER DEVICE CONNECTED TO THE DRILLING TOOL AT A POINT SPACED FROM THE HINGED CONNECTION TO THE FEED LEG FOR TILTING THE TOOL ABOUT ITS HINGED CONNECTION RELATIVE TO THE FEED LEG AND TO APPLY A DOWNWARD PRESSURE TO THE REAR END OF THE DRILLING TOOL AS THE LATTER IS ADVANCED TOWARD THE WORK DURING DRILLING UPON EXTENSION OF THE FEED LEG, THE EXTENSION OF SAID FEED LEG AND CONCURRENT DOWNWARD PRESSURE ON THE REAR END OF SAID TOOL IN COOPERATION EFFECTING FEED OF THE TOOL TOWARD THE WORK AND THE POSITION OF SAID TOOL RELATIVE TO SAID FEED LEG DURING THE DRILLING OPERATION, AND CONTROL MEANS CARRIED BY SAID DRILLING TOOL FOR SAID FEED LEG AND SAID AUXILIARY POWER DEVICE FOR PERMITTING THE OPERATOR TO COORDINATE THE ACTION OF SAID FEED LEG AND SAID AUXILIARY POWER DEVICE BY THE REGULATION OF SAID CONTROL MEANS BY THE OPERATOR.